Nut-lock washer.



No. 643,485. S Pat'ented Feb. I3, I900.

. znmounsuu.

LOCK WASH (Applicatiqn filed. May 9, 1

(no Model.)

WITNESSES 701? NITED STATES PATENT FFICE.

EDIVIN L. EDMONDSON, OF STAUNTON, VIRGINIA.

NUT-LOCK WASHER.

SPECIFICATION forming part of Letters Patent N 0. 643,485, dated February 13, 1900.

Application filed May 9, 1899. Serial No. 716,114. (No model.)

To ctZZ whmn it may concern:

Be it known that I, EDWIN L. EDMONDSON, a citizen of the United States, residing at Staunton, in the county of Augusta and State of Virginia, have invented certain new and useful Improvements in Nut-Lock Washers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to nut-locks; and it has for its object to provide a device of this character which will have a double locking action, so as to hold the nut firmly in its place and prevent it from turning.

With this end in View the said invention consists in a peculiar construction that will be hereinafter more fully set forth, and particularly pointed out in the claims.

Figure 1 illustrates a vertical longitudinal section of the washer screwed down in working position. Fig. 2 shows a top plan View of the washer with slits substantially in direct line and parallel to each other. Fig. 3 shows a section of the washer taken on the line a a: of Fig. 2. Fig. 4 shows a plan view of the washer, with two slits substantially parallel with each other entering the body of the washer from opposite points. Fig. 5 shows a vertical section taken on the line y y of the washer shown by'Fi'gflT Fig. 6 shows a vertical section of the washer, with the nut partially screwed down, showing the spring-surface against the nut. Fig. 7 is a side elevation with the washer in a locked position.

In Figs. 2 and 4 it will be observed that the portion 9 represents an integral portion of the metal, which when twisted or turned holds the points ff together and in position.

Like letters are used to indicate corresponding parts in the several figures.

In the drawings, A designates the bolt, having the head and screw-threaded end common to allbolts, and B designates the nut, which is adapted to screw upon said bolt, and to keep this nut in a rigid position I employ my improved nut-lock, which consists of the concave-converted washer -plate 0, forming a spring to press upward against the bottom of the nut. In the body portion of the washerplate is the bolt-aperture E, through which passes the end of the bolt, the nut being placed upon the bolt after the plate.

The washer-plate is preferably circular in form and is constructed, preferably, of thin sheet spring metal and is larger than the nut, the outer periphery or edge of the washerplate having two slits e in line with each other and substantially parallel to similar slits 011 each side of the bolt-aperture and on the opposite side of the washer, so as to form points ff. These points or prongs are bent by one motion of a wrench or tweezers or similar tool, the integral portion of the plate between the-two slits acting as a stem g, the one pointf turning up, engaging the side of and locking the nut, the other point j turning down, engaging the side of the object D, Y

through which the bolt passes. To further prevent the washer-plate from turning upon or from working loose from the surface of the object D, the washer-plate is provided with two serrations or raised projections dd,which engage or bite into the surface G of object D, thus preventing the washer-plate from turning or working loose.

The operation of my invention will be readil y understood from the foregoing description, taken inconnection with the annexed drawing s. After the bolt has been placed through the object D the washer-plate C is passed over the threaded end of the bolt, so that the two serrations or raised projections will engage the surface of the object D and take a firm hold against the same. The nut is then turned over the threaded end of the bolt, so as to come against the top and concave side of the washer plate 0, against which it bears. By this action the washer-plate tends to flatten, thus forming a spring and pressing up against the bottom of the nut. Atthe same time the ser= rations or raised projections engage or bite into the surface G of the object D. When the not has been screwed sufficiently tight, it is then held from turning by bending up one of the points f against the side of the nut, which act also bends the other point f down against and engages the side of the object D, thus by one motion locking the nut and at the same time preventing the Washerplate from any further motion or play upon the surface of the object D. Should it happen in turning back the points f f in order to unscrew the nut they should break off, then the other side of the washer may be placed so as to occupy the broken-oif portion, and the same operation of the wrench or tweezers may be used, turning the pointsf f, as before, locking the object D and the nut. Thus it will be seen that the same washer may be utilized over and over again. It will be further observed by referring to Fig. 4: that one of the slits may be formed out of line with the other on the same side of the washer, so that when the object D is wider than the nut the outer point f maybe turned down so as to engage the object D, and the other pointf turned up to engage the nut, so as to provide for irregular surfaces.

I do not wish to limit myself to any particular application of my improved nut-lock, for it is apparent that it may be applied to all machinery where it is desired to hold nuts from turning and that the lock is very simple, durable, and cheap, thus making it a useful and practical article.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is

1. A nut-lock consisting of a washer-plate having two slits substantially in line with each other upon the same side of the bolt-aperture, and entering the body of the washer from opposite points with an integral portion of metal between them,whereby, bya turn of a wrench or similar tool, the points may be turned in opposite directions to engage the nut and the object beneath the nut, substantially as described.

2. A nut-lock consisting of a washer-plate having two slits out in substantially the same direction upon the same side of the bolt-aperture, and entering the body of the washer from opposite points, with an integral portion of metal between them, whereby, by a turn of a wrench or similar tool the points may be turned in opposite directions, to engage the nut and the object beneath it, substantially as set forth.

3. A nut-lock consisting ofa concave washer havingprojections downwardly punched from the upper surface thereof, and having slits substantially in line with each other upon the same side of the bolt-aperture, and entering the body of the washer from opposite points, with an integral portion of the metal between the slits whereby, by a turn of a wrench or similar tool, the points may be turned in opsite directions, to engage the nut and the object beneath the nut, substantially as shown and described.

In testimony whereof I afiix my signature in presence of two witnesses.

EDWIN L. EDMONDSON. Witnesses:

W. R. TYREE, Jr., A. W. BLACKLEY. 

